I know there are a lot of giveaways not just in Binance but also in other exchanges. This mostly happens when coins are newly listed. This is apparently a strategy to attract traders and HODLers or to increase volume. For example, Komodo (KMD) has just finally got the green light from Binance hours ago. They are now offering KMD staking.

These are great updates although I don't personally run after these kinds of promos. But there might be some members here in the local section who are particularly interested about these things so this is still helpful.